The Echinoid Directory

Family Urechinidae Duncan, 1889, p. 211

Diagnosis	Urechinine holasteroid echinoids with: thin-plated test; ambulacral pores outside phyllodes single; no anterior sulcus; no rostral plate; periproct inframarginal; subanal fasciole generally present (unknown in some species represented by adults only).
Range	Recent; worldwide (deep sea).

Diagnosis

Urechinine holasteroid echinoids with:

thin-plated test;
ambulacral pores outside phyllodes single;
no anterior sulcus;
no rostral plate;
periproct inframarginal;
subanal fasciole generally present (unknown in some species represented by adults only).

Range

Recent; worldwide (deep sea).